[C320-list] Engine / shaft alignment

[Scott Thompson]

Thanks.  A good Memorial Day project.  Wish I knew this last weekend!


Jeff Church wrote:
> That's correct. Once loosened you can tap the bottom portion of the 
> mount with a small hammer or similar object and it will move. As the 
> bottom moves, the top will twist and you will need to re-align it with 
> the bottom by tapping or prying.
> 
> 
> ----- Original Message ----- From: "Scott Thompson" <sthompson at toad.net>
> To: "C320-List" <C320-List at catalina320.com>
> Sent: Monday, May 22, 2006 11:25 AM
> Subject: Re: [C320-list] Engine / shaft alignment
> 
> 
>> So is the idea that I rotate the mounts themselves a bit?  I imagine I 
>> have to loosen the top nuts on each mount so that the mounts can 
>> rotate underneath.
>>
>> Jeff Church wrote:
>>> Scott,
>>>
>>> Take a closer look at the lower portion of the motor mount where it 
>>> bolts into the engine bunk. The aft holes on the aft mounts and the 
>>> forward holes on the forward mounts are elongated so that the engine 
>>> can be angled or shifted laterally.
>>>
>>> JeffC
>>>
>>>
>>> ----- Original Message ----- From: "Scott Thompson" <sthompson at toad.net>
>>> To: "C320-List" <C320-List at catalina320.com>
>>> Sent: Saturday, May 20, 2006 8:36 PM
>>> Subject: [C320-list] Engine / shaft alignment
>>>
>>>
>>>> Surprise now has a Gori 2 blade folding prop to replace the 3 blade 
>>>> fixed. So far I'm satisfied, except that there is definitely quite a 
>>>> bit more vibration under power than before.  Today I tried to tackle 
>>>> this by doing a shaft alignment.  This is a job I've ignored since 
>>>> owning the boat and have been rather nervous about that situation.  
>>>> When I unbolted the flanges I found that the engine flange did not 
>>>> line up well with the shaft, and was a bit higher.  I was able to 
>>>> get the alignment much better in the fore-aft plane using the 
>>>> adjustment advice in my owners manual, but was left with somewhat 
>>>> excessive side to side misalignment. To be precise, the two flanges 
>>>> have good axial alignment and are even top to bottom, but there is a 
>>>> bit of a gap (about .014 inches by my feeler gauge on the starboard 
>>>> side.  I can't figure out how to tune this out.  It would seem to 
>>>> require moving the front of the engine slightly to starboard, but I 
>>>> don't see any way to adjust the engine mounts laterally.  How is 
>>>> this supposed to be done?  I have the Yanmar 3GM30F, 1999 model.
>>>>
>>>> Scott Thompson
>>>> Surprise, 653
>>>>
>>>>
>>>
>>
>>
>